I believe gasoline is injected at the port air intake and MW50 is injected at the supercharger exhaust. From what I understand some A5 and possibly A4 models were retroactively fitted with erhönte notleistung (either type) during 1943 and kept in service as fighter-bombers (ie. schlachtgeschwader) after later models had been introduced. The gasoline injection was serially produced for the Fw190G-3, based on the A-6 airframe from October 1943. The A-8 received most commonly MW50 system in serial production from January 1944 and the F-8 received most commonly gasoline injection system in serial production from March 1944.
Initially a restriction of 1000 metres altitude was placed on sondernotleistung, and the low supercharger gear specified. This restriction was removed when fitted to 190A models and postwar American testing of an Fw190G did not understand why German documentation listed altitude/blower restrictions on the Fw190G/F and not the Fw190A-8 although truth be told most Fw190A, except for a handful of retroactive fitments on earlier models apparently used the MW50 system at least in serial production. Other restrictions placed on its use was that it could only be engaged in severe emergencies, at high speed and for as little time as possible, with the throttle fully open and prop pitch under kommandogerät control.
At sea level output is claimed ca.1730hp for the 801D-2 at 1.42atü start u/notleistung and ca.1870hp at 1.65atü sondernotleistung in the postwar US tests of a captured Fw190G using the gasoline injection.
So you might see an A-4 with the boost system fitted, but if in actual service not before about mid 1943 and probably in a schlachtgeschwader. Possible for an exception in testing purposes.